Neck stiffness. Damage has happened?

My neck stiffness, headaches, etc started after stopping psych meds like fluoxetine. Post stopping, I lost sleep, got neck muscles spasms, headaches migraines, eye sensitivity, lost lot of weight, and no sleep. Even meds had stopped working on restarting after months. MRI brain taken after 2 years was normal. But I'm still having insomnia, memory issues and focus and slight co-ordination issues. Breathing also is shallow. Is it only a neurotransmitters imbalance or blood flow or csf flow was affected due to this? I had severe bursting headaches, neck stiffness etc. with homeopathy, the migraines and neck stiffness got cleared. As soon as this got resolved, light sensitivity disappeared but tinnitus started. I also had acidity, gas that time. Did I injure my brain or no? Because MRI brain is normal. Any neuronal damage has happened? Please guide correctly.